.mark{
    width: 100%;
    height: 100%;
    display: block;
    position: fixed;
    background: rgba(0,0,0,.4);
    top: 0;
    left: 0;
    z-index: 9999;
}
.mark-text{
    color: white;
    margin-top: 30px;
    font-size: 16px;
}
.loading{
    width: 80px;
    height: 40px;
    margin: 0 auto;
}
.loading span{
    display: inline-block;
    width: 8px;
    height: 100%;
    border-radius: 4px;
    background: white;
    -webkit-animation: load 1s ease infinite;
}
@-webkit-keyframes load{
    0%,100%{
        height: 40px;
        background: white;
    }
    50%{
        height: 70px;
        margin: -15px 0;
        background: white;
    }
}
.loading span:nth-child(2){
    -webkit-animation-delay:0.2s;
}
.loading span:nth-child(3){
    -webkit-animation-delay:0.4s;
}
.loading span:nth-child(4){
    -webkit-animation-delay:0.6s;
}
.loading span:nth-child(5){
    -webkit-animation-delay:0.8s;
}
